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By certification 
Features:
1.2.4GHz wireless technology
2. Personal volume control
3. Get rid of burdened headphones/hearing aids
4. Adjustable speaker height
5. Separate Left&Rright speaker for different location
6. Hearing TV without filling the room with sound
7. Easy installation, applicable to sofa/head of bed
8. No longer isolated from surrounding environment
9. Compatible with various TV and audio sources
1.2.4GHz wireless technology
2. Personal volume control
3. Get rid of burdened headphones/hearing aids
4. Adjustable speaker height
5. Separate Left&Rright speaker for different location
6. Hearing TV without filling the room with sound
7. Easy installation, applicable to sofa/head of bed
8. No longer isolated from surrounding environment
9. Compatible with various TV and audio sources